// Adds an item to the cart
function addItem ( formname, itemName, itemOption ) {
   var orderForm = document.forms[formname];

   // Set item and price
   if ( itemName == "hat" ) {
      orderForm.item_name.value = "Hat";
      orderForm.amount.value = "15.00";
   }
   else if ( itemName == "tshirt" ) {
      orderForm.item_name.value = "T-Shirt" + " " + itemOption;
      orderForm.amount.value = "12.00";
   }
   else if ( itemName == "regular_ticket" ) {
      orderForm.item_name.value = "Ticket";
      orderForm.amount.value = "10.00";
   }
   else if ( itemName == "early_ticket" ) {
      orderForm.item_name.value = "Advance ticket";
      orderForm.amount.value = "7.00";
   }
   else if ( itemName == "early_ticket_10" ) {
      orderForm.item_name.value = "10 advance tickets";
      orderForm.amount.value = "63.00";
   }
   else if ( itemName == "early_ticket_20" ) {
      orderForm.item_name.value = "20 advance ticket";
      orderForm.amount.value = "112.00";
   }
   else if ( itemName == "early_ticket_50" ) {
      orderForm.item_name.value = "50 advance ticket";
      orderForm.amount.value = "250.00";
   }
   else if ( itemName == "early_ticket_100" ) {
      orderForm.item_name.value = "100 advance tickets";
      orderForm.amount.value = "420.00";
   }
   else if ( itemName == "foodticket" ) {
      orderForm.item_name.value = "Food ticket";
      orderForm.amount.value = "1.00";
   }
   else if ( itemName == "donation" ) {
      orderForm.item_name.value = "Donation";
      orderForm.amount.value = "1.00";
   }

   // pop-up PayPal window
   showCart();

   // submit form
   orderForm.submit();

   return true;
}


// Displays cart
function reviewCart ( formname ) {
   var reviewForm = document.forms[formname];

   showCart();
   reviewForm.submit();

   return true;
}


//
function showCart () {
   window.open(
      "",
      "paypal",
      "width=600,height=400,scrollbars,location,resizable,status");
}